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首页> 外文期刊>Plant Species Biology >Ecological significance of microsatellite variation in western North American populations of Bromus tectorum.
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Ecological significance of microsatellite variation in western North American populations of Bromus tectorum.

机译：北美西部鹤麦种群中微卫星变异的生态意义。

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Bromus tectorum (cheatgrass or downy brome) is an exotic annual weed that is abundant in western USA. We examined variation in six microsatellite loci for 17 populations representing a range of habitats in Utah, Idaho, Nevada and Colorado (USA) and then intensively sampled four representative populations, for a total sample size of approximately 1000 individuals. All loci were homozygous, indicating that the species is strongly selfing. Populations consisted of a few common genotypes and variable numbers of rare genotypes. Small sample sizes (n=10 individuals) were adequate for distinguishing among populations, but larger sample sizes were needed to characterize more diverse populations, particularly in terms of genotype. Large populations contained more genetic diversity than small populations in terms of both number of alleles per locus and number of genotypes. Genetic distance among survey populations was much more strongly correlated with ecological distance (habitat) than with geographical distance, and was also strongly correlated with a suite of adaptively significant seed germination traits. This suggests that similar habitats across the range of B. tectorum in western USA select for specific self-pollinating lines from an array of widely distributed genotypes. Because all traits are effectively linked in this selfing organism, the distribution of adaptively significant genetic variation can be successfully inferred from an examination of microsatellite marker variation..
机译：胸腺（Cheatgrass或downy brome）是一种异国一年生杂草，在美国西部盛产。我们检查了代表犹他州，爱达荷州，内华达州和科罗拉多州（美国）一系列栖息地的17个种群的六个微卫星基因座的变异，然后对四个代表性种群进行了密集采样，总样本量约为1000个个体。所有基因座均为纯合子，表明该物种强自交。种群由几种常见基因型和数量可变的稀有基因型组成。小样本量（n = 10个人）足以区分人群，但是需要更大的样本量来表征更多不同的人群，尤其是在基因型方面。就每个基因座的等位基因数目和基因型数目而言，大种群比小种群具有更多的遗传多样性。调查种群之间的遗传距离与生态距离（栖息地）的相关性远比与地理距离的相关性强，并且与一系列具有适应性的重要种子萌发性状也具有很强的相关性。这表明在美国西部的整个裂殖芽孢杆菌范围内，相似的栖息地会从一系列广泛分布的基因型中选择特定的自花传粉系。由于在该自交生物中所有特征均有效连接，因此可以通过检查微卫星标记变异成功推断出具有适应性的重要遗传变异的分布。

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